import java.util.HashMap;
import java.util.Map;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: 23735
 * Date: 2022-10-06
 * Time: 15:10
 */

class Node {
    int val;
    Node next;
    Node random;

    public Node(int val) {
        this.val = val;
        this.next = null;
        this.random = null;
    }
}

public class Main {
    public Node copyRandomList(Node head) {
        Map<Node,Node> map=new HashMap<>();
        Node cur=head;
        while(cur!=null){
            Node node=new Node(cur.val);
            map.put(cur,node);
            cur=cur.next;
        }
        cur=head;
        while(cur!=null){
            map.get(cur).next=map.get(cur.next);
            map.get(cur).random=map.get(cur.random);
            cur=cur.next;
        }
        return map.get(head);
    }
}
